Why do astronomers believe that Earth's water could NOT have come from comets similar to Comet Churyumov-Gerasimenko?
A) Comets do not come close enough to Earth's orbit.
B) There is not nearly enough water stored in the comet population to provide Earth's water.
C) That comet's water has a very different isotope ratio than Earth's water.
D) Comets were not formed until after Earth already had most of its water.
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